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23#
發表於 2009-3-26 01:29 PM
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pure math8 A" q" d( G. X( z; M+ j
公仔箱論壇8 j: ?" F& M; a% a. f
[250(80x+1)+2y-250]/2 = (250*80x+2y)/2 = (2000x+2y)/2 = 1000x+y
( F9 r, H' g) F5.39.217.77) v* l& u/ n8 J- h1 x) q* U
if x = 111 y = 2222, you number is 111-2222 |
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